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LM336MX-2.5

2.49V shunt reference, 0.2Ohm, adjustable tempco, SOIC-8

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Manufacturer Part：

LM336MX-2.5

Package：

SOIC-8 / D-8 (4.9 x 3.9 x 1.5 mm, 1.27mm pitch)

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Description

Product Overview

The LM336MX-2.5 from Texas Instruments is a precision 2.49V shunt voltage reference diode in an SOIC-8 package. With 0.2 Ohm dynamic impedance and adjustable temperature coefficient via the ADJ pin, it provides a stable 2.5V reference ideal for 5V logic systems and 8-bit data acquisition.

Key Specifications

Reference Voltage 2.49V nominal
Initial Accuracy +/-4% (standard), +/-1% (B grade)
Operating Current Range 400 uA to 10 mA
Dynamic Impedance 0.2 Ohm typical
Temperature Coefficient 34 ppm/C max
Temperature Stability 1.8 mV max over 0 to 70C
Long-Term Stability 20 ppm typical
Operating Temperature 0 to 70 C
Package SOIC-8 (D)

Features

  • Precision 2.49V shunt reference
  • Ultra-low dynamic impedance: 0.2 Ohm
  • Wide operating current: 400uA to 10mA
  • Adjustable temperature coefficient via ADJ pin
  • +/-1% tolerance available (B grade)
  • Guaranteed temperature stability
  • Fast turn-on
  • Operates as positive or negative reference
  • Direct 5V logic supply reference

Applications

  • 2.5V reference for 5V logic systems
  • 8-bit ADC/DAC voltage reference
  • Digital voltmeter reference
  • Current loop measurement systems
  • Power supply monitoring

The LM336MX-2.5 from TI is a precision 2.49V shunt voltage reference in SOIC-8. Features ultra-low 0.2 Ohm dynamic impedance, 400uA to 10mA operating current, and adjustable temperature coefficient via the ADJ pin. The 2.49V output is convenient for obtaining a stable reference from 5V logic supplies. MX suffix denotes SOIC-8 tape-and-reel. Ideal for 8-bit ADC/DAC references and digital voltmeters.

The LM336-2.5 uses a bandgap reference circuit to generate a stable 2.49V shunt voltage. The 0.2 Ohm dynamic impedance is significantly better than conventional Zener diodes, providing excellent load regulation. The ADJ pin connects to the internal bandgap node and can be used with external resistors to trim both the output voltage and minimize the temperature coefficient. When adjusted to exactly 2.49V using a potentiometer and series diodes, the temperature coefficient can approach zero, making it ideal for precision applications.

Pin Name Type Function
1 ADJ Input Adjust terminal (for voltage/tempco trimming)
2 V+ Output Positive terminal (cathode)
3 V- Ground Negative terminal (anode)
4-8 NC – No connect
  • 2.5V ADC reference for 8-bit data acquisition from 5V supply
  • Digital voltmeter half-scale reference
  • 4-20mA current loop measurement reference
  • Precision comparator threshold reference
  • Battery-powered instrumentation reference
Manufacturer Part Number Package Notes
TI LM336Z-2.5/NOPB TO-92 TO-92 through-hole version
ADI LT1009CZ TO-92 +/-5% 2.5V reference
TI TL431AIACT SOT-23-3 Programmable shunt, smaller package
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